Stop bar



Aug 1 .2 19% LEM-3% O. A. HOKANSON STOP BAR Filed Sept. 22 1919 Patented Aug. 12, 122 1.

OTTO A. HOKANSON, OF WOODSTOCK, ILLINOIS, ASSIGNOR T WOODSTOCK TYPE- WRITER COMPANY, OF WOODSTOCK, ILLINOIS, A CORPORATION OF ILLINOIS.

STOP BAR.

Application filed September 22, 1919. Serial No. 325,400.

To all whom it may concern.

Be it known that I, Orro A. HoKANsoN,

a citizen of the United States, residing at Woodstock, in the county of McHenry and State of Illinois, have invented certain new and useful Improvements in Stop Bars, of

which the following is a specification.

This invention has for its object the provision of a device of the class named which 1 shall be of improved construction and operation.

The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing- Fig. 1 is an elevation with parts broken away showing a part of a typewriter frame having one embodiment; of the present invention;

Fig. 2 is a vertical section on line. 2-2 of Fig. 1; and

Fig. 3 is a vertical section on line 3-3 of Fig. 1.

In Fig. 1 of the drawing the numeral designates a portion of the platen carriage frame of a typewriter having a slide rail 11 provided with a ball race 12 by means of which the platen carriage is supported to travel along the frame of the typewriter. The numeral 13 designates a pivot shaft about which the platen is shifted when changing from lower to upper case: type. 141 is a portion of the stationary frame of a typewriter forming one of the supporting ways along which the platen carriage travels. The margin and tabulator stop bar W 15 is supported in the platen carriage frame 10 and is provided with vertical grooves 16 for receiving tabulator stops 17 and a holding member 18. One end of the bar 15 is carried by a pivot stud 19 threaded into an opening in the frame 10, as shown at the left of Fig. 1, the pivot stud being provided with a bearing portion 20 which enters a cylindrical opening 21 in the end of the bar 15. A coil spring 22 is seated in the opening 21 and bears against the end of the stud 19 and the bottom of the opening 21 to force the bar 15 to the right, as viewed in Fig. 1. The opposite end of the bar 15 is also provided with an opening 23 journaled on a bearing stud 24 which is threaded through an opening in the frame member 10. The bearing stud 24 is provided with a shoulder 25 arranged to bear against the end of the bar 15 and a washer 26 may be interposed between the shoulder and the end of the bar. It will be seen that when the stud 21 is screw-ed. into the opening in the frame member 10 the shoulder 25 will force the bar to the left, as viewed in Fig. 1, against the compression of the spring 22. In this Way the longitudinal position of the bar 15 may be very accurately adjusted and when it has been, set at the proper position it is held against acct dental displacement by a set screw 27 having a lock nut 28. The bar 15 is held against rotation on its pivotal support by the holding member 18 which is provided with an arm 29 arranged to lie in one of the grooves 16 in the bar 15. The arm 29 has a projection 30 at its lower end for springing into place beneath the lower face of the bar 15 to prevent accidental displacement of the holding member. The holding member 18 is provided with a pair of arms 31 which straddle the bar 13 and prevent rotation of the stop bar 15.

The tabulator stops 17 are provided with arms 32 and 33 arranged to enter the grooves 16 in the bar 15 to hold the tabulator stops in adjusted positions along the bar 15. The arm 32 is pro-vided with a resilient connection 34 and a lug 35 for retaining the stop in place on the bar 15. A movable stop 36 rests on the upper face of the slideway 145 and is arranged to be thrown upwardly into the path of the downwardly projecting end of the tabulator stop 17 when the tabulator key is depressed to release the platen carriage in a manner well known in the art. The relative movement of the platen carriage when released by the tabulator key and the stop 36 is such that when the stop 36 is engaged by one of the adjustable stops 17 the impact of the blow will be received by the coil spring 22 which forms a cushion for this purpose. When the platen carriage is arrested by one of the adjustable stops 17 it is evident that the carriage should be in the same position as it would be if held by some one of the teeth of the escapement mechanism so that the letter spacing in the line will not be disturbed. The position at Which the platen is arrested may be very accurately adjusted by means of the screw stud 24 and Whenit is once properly arranged the stud may be locked in place to prevent any disturbance of the adjustment. The position of the margin stop is also adjusted by the screw stud 24 at the same time that the bar 15 is set by this scre' v for adjusting the tabulator stop.

I claim 1. In a typewriter, a platen carriage, a stop bar therefor, a journal support for one end of said stop bar arranged to permit rotation of said bar about its axis a spring for forcing said bar away from said support the opposite end of said bar having a cylindrical o enin therein a screw )lue" mount- ?3 7 V V s..

ed in said platen carriage and arranged in said opening to provide a journal bearing for said bar, said plug having threaded connection With said carriage and movable in said threadedconnection to force said step bar endWise against the tension of said spring to adjust the position of said stop bar, and a detachable device for holding said stop bar against rotation.

'52.; The combination 'With a platen carriage of a stop bar therefor comprising an elongated member having transverse grooves therein and having cylindrical openings at the opposite ends thereof, a coil spring held in one of said openings a cylindrical stud extending from said platen carriage and arranged to enter said opening to retain said spring therein and to provide a pivotal support for said bar, a screw plug having a cylindrical stud threaded into said carriage and arranged to enter the opening at the end of said bar opposite said spring and provided with a pivotal support for said bar, said plug being arranged to force said bar endwise against the tension of said spring, when turned in its threaded connection With said platen carriage, a retainer arranged to engage the slots in said bar, and means on said carriage for engaging said retainer to hold said bar against rotation, said last-named means being arranged to permit movement of said retainer in unison with longitudinal movement of said bar.

In testimony whereoi I have signed my name to this specification on this 19th day of September, A. D. 1919.

OTTO A. HOKANSON. 

